Quetta - Two coalminers were killed and five others fell unconscious after a coalmine filled with poisonous gas, on Thursday. According to reports reaching here, over 10 coalminers were busy in extracting coal from a mine in district Harnai when it filled with poisonous gas due to poor ventilating system. Resultantly, two miners identified as Khair Muhammad and Abdul Kareem suffocated while five others fell unconscious.Rescue workers and local people retrieved the victims from mine and shifted them to hospital were condition of two miners was stated to be serious.